:root {
    --ink: #1a1814;
    --ink-mid: #4a4640;
    --ink-light: #9a9490;
    --paper: #f7f4ef;
    --paper-mid: #ede9e2;
    --paper-dark: #ddd8cf;
    --accent: #8b3a2a;
    --accent-light: #c4735f;
    --success: #2a6b4a;
    --success-bg: #f0f7f3;
    --success-border: #b8d9c8;
    --warning: #7a5c1a;
    --warning-bg: #fdf5e0;
    --warning-border: #e8d090;
    --rule: #d0cbc2;
    --mono: 'JetBrains Mono', monospace;
    --serif: 'Spectral', Georgia, serif;
    --sans: 'Barlow', sans-serif;
  }

  * { box-sizing: border-box; margin: 0; padding: 0; }
  body {
    background: var(--paper);
    color: var(--ink);
    font-family: var(--sans);
    font-size: 15px;
    line-height: 1.6;
    min-height: 100vh;
  }

  /* ── Header ── */
  header {
    border-bottom: 2px solid var(--ink);
    padding: 1.75rem 3rem 1.5rem;
    display: flex;
    align-items: baseline;
    gap: 2rem;
    flex-wrap: wrap;
  }
  .logo { font-family: var(--serif); font-weight: 300; font-size: 1.4rem; letter-spacing: -0.02em; }
  .logo em { font-style: italic; color: var(--accent); }
  .phase-tag {
    font-family: var(--mono); font-size: 0.68rem; letter-spacing: 0.12em;
    text-transform: uppercase; color: var(--paper); background: var(--ink);
    padding: 0.25rem 0.65rem; border-radius: 2px;
  }
  .nav-links { margin-left: auto; display: flex; gap: 1.5rem; }
  .nav-link {
    font-family: var(--mono); font-size: 0.65rem; letter-spacing: 0.08em;
    text-transform: uppercase; color: var(--ink-light); text-decoration: none;
    border-bottom: 1px solid transparent; transition: color 0.15s, border-color 0.15s;
  }
  .nav-link:hover { color: var(--accent); border-color: var(--accent); }

  /* ── Workspace ── */
  .workspace { max-width: 1100px; margin: 0 auto; padding: 2.5rem 3rem; }

  .section-head {
    font-family: var(--mono); font-size: 0.65rem; letter-spacing: 0.15em;
    text-transform: uppercase; color: var(--ink-light); margin-bottom: 1.25rem;
    display: flex; align-items: center; gap: 0.75rem;
  }
  .section-head::after { content: ''; flex: 1; height: 1px; background: var(--rule); }

  /* ── Config grid ── */
  .config-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
  }

  .config-card {
    background: white;
    border: 1px solid var(--rule);
    border-radius: 4px;
    padding: 1.5rem;
  }

  .config-card-title {
    font-family: var(--mono); font-size: 0.65rem; letter-spacing: 0.12em;
    text-transform: uppercase; color: var(--ink-mid); margin-bottom: 1rem;
  }

  /* ── Mode selector ── */
  .mode-group { display: flex; gap: 0; border: 1px solid var(--paper-dark); border-radius: 3px; overflow: hidden; margin-bottom: 1rem; }
  .mode-option { flex: 1; position: relative; }
  .mode-option input[type="radio"] { position: absolute; opacity: 0; width: 0; }
  .mode-option label {
    display: block; text-align: center; padding: 0.6rem 0.75rem; cursor: pointer;
    background: white; font-size: 0.75rem; font-weight: 500; letter-spacing: 0.04em;
    border-right: 1px solid var(--paper-dark); transition: background 0.15s, color 0.15s;
    text-transform: uppercase; margin: 0; font-family: var(--sans);
  }
  .mode-option:last-child label { border-right: none; }
  .mode-option input[type="radio"]:checked + label { background: var(--ink); color: var(--paper); }

  .scale-ref {
    background: var(--paper); border: 1px solid var(--rule); border-radius: 3px;
    padding: 0.75rem 1rem; display: grid; grid-template-columns: auto 1fr;
    gap: 0.2rem 0.75rem; font-size: 0.72rem;
  }
  .scale-score { font-family: var(--mono); font-weight: 500; color: var(--accent); }
  .scale-desc { color: var(--ink-mid); }

  /* ── Number input ── */
  .field { margin-bottom: 1rem; }
  .field label {
    display: block; font-size: 0.75rem; font-weight: 600; letter-spacing: 0.04em;
    color: var(--ink-mid); margin-bottom: 0.35rem; text-transform: uppercase;
  }
  .field input[type="number"] {
    width: 100%; background: white; border: 1px solid var(--paper-dark); border-radius: 3px;
    padding: 0.6rem 0.75rem; font-family: var(--mono); font-size: 0.82rem;
    color: var(--ink); outline: none; transition: border-color 0.15s;
  }
  .field input[type="number"]:focus { border-color: var(--ink-mid); }
  .field-hint { font-size: 0.72rem; color: var(--ink-light); font-style: italic; font-family: var(--serif); margin-top: 0.25rem; }

  /* ── Upload zones ── */
  .upload-zone {
    border: 2px dashed var(--paper-dark); border-radius: 4px; padding: 1.25rem;
    text-align: center; cursor: pointer; transition: border-color 0.2s, background 0.2s;
    background: white; position: relative; min-height: 90px;
    display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 0.35rem;
  }
  .upload-zone:hover, .upload-zone.drag-over { border-color: var(--accent-light); background: #fdf9f7; }
  .upload-zone.loaded { border-style: solid; border-color: var(--success); background: var(--success-bg); cursor: default; }
  .upload-zone input[type="file"] { position: absolute; inset: 0; opacity: 0; cursor: pointer; width: 100%; height: 100%; }
  .upload-zone.loaded input { pointer-events: none; }
  .upload-icon { font-size: 1.4rem; color: var(--ink-light); line-height: 1; }
  .upload-zone.loaded .upload-icon { color: var(--success); }
  .upload-text { font-size: 0.8rem; color: var(--ink-mid); }
  .upload-text strong { color: var(--ink); }
  .upload-zone.loaded .upload-text { color: var(--success); font-weight: 500; font-size: 0.78rem; }
  .upload-sub { font-family: var(--mono); font-size: 0.62rem; color: var(--ink-light); }
  .upload-clear {
    position: absolute; top: 0.4rem; right: 0.5rem; background: none; border: none;
    cursor: pointer; color: var(--ink-light); font-size: 0.85rem; z-index: 2;
  }
  .upload-clear:hover { color: var(--accent); }

  /* ── Corpus file list ── */
  .corpus-section { margin-bottom: 2rem; }

  .corpus-upload-row {
    display: flex; gap: 1rem; align-items: stretch; margin-bottom: 1rem;
  }

  .corpus-drop-zone {
    flex: 1; border: 2px dashed var(--paper-dark); border-radius: 4px; padding: 1.5rem 2rem;
    display: flex; align-items: center; gap: 1.5rem; background: white;
    transition: border-color 0.2s, background 0.2s; position: relative; cursor: pointer;
  }
  .corpus-drop-zone:hover, .corpus-drop-zone.drag-over { border-color: var(--accent-light); background: #fdf9f7; }
  .corpus-drop-zone input { position: absolute; inset: 0; opacity: 0; cursor: pointer; width: 100%; height: 100%; }
  .corpus-drop-icon { font-size: 2rem; color: var(--ink-light); flex-shrink: 0; }
  .corpus-drop-text { font-size: 0.85rem; color: var(--ink-mid); }
  .corpus-drop-text strong { color: var(--ink); display: block; margin-bottom: 0.2rem; font-size: 0.9rem; }
  .corpus-drop-sub { font-family: var(--mono); font-size: 0.65rem; color: var(--ink-light); margin-top: 0.2rem; }

  .corpus-folder-btn {
    flex-shrink: 0; border: 2px dashed var(--paper-dark); border-radius: 4px;
    padding: 1rem 1.5rem; background: white; cursor: pointer; position: relative;
    display: flex; flex-direction: column; align-items: center; justify-content: center;
    gap: 0.35rem; transition: border-color 0.2s, background 0.2s; min-width: 130px;
    font-family: var(--mono); font-size: 0.65rem; color: var(--ink-light);
    letter-spacing: 0.06em; text-transform: uppercase; text-align: center;
  }
  .corpus-folder-btn:hover { border-color: var(--accent-light); background: #fdf9f7; color: var(--accent); }
  .corpus-folder-btn input { position: absolute; inset: 0; opacity: 0; cursor: pointer; width: 100%; height: 100%; }
  .corpus-folder-btn span:first-child { font-size: 1.4rem; }

  .corpus-summary {
    display: flex; align-items: center; justify-content: space-between;
    padding: 0.75rem 1rem; background: var(--paper-mid); border-radius: 3px;
    margin-bottom: 0.75rem; flex-wrap: wrap; gap: 0.5rem;
  }
  .corpus-summary-text { font-family: var(--mono); font-size: 0.72rem; color: var(--ink-mid); }
  .corpus-summary-text strong { color: var(--ink); }
  .corpus-clear-btn {
    background: none; border: 1px solid var(--paper-dark); border-radius: 2px;
    padding: 0.2rem 0.6rem; font-family: var(--mono); font-size: 0.62rem;
    letter-spacing: 0.06em; text-transform: uppercase; color: var(--ink-light);
    cursor: pointer; transition: all 0.15s;
  }
  .corpus-clear-btn:hover { border-color: var(--accent); color: var(--accent); }

  .corpus-file-list {
    max-height: 220px; overflow-y: auto; border: 1px solid var(--rule);
    border-radius: 3px; background: white;
  }
  .corpus-file-item {
    display: grid; grid-template-columns: 2rem 1fr auto auto;
    align-items: center; gap: 0.5rem; padding: 0.45rem 0.75rem;
    border-bottom: 1px solid var(--paper-mid); font-size: 0.75rem;
  }
  .corpus-file-item:last-child { border-bottom: none; }
  .corpus-file-item.excluded { opacity: 0.4; }
  .file-num { font-family: var(--mono); font-size: 0.62rem; color: var(--ink-light); text-align: right; }
  .file-id { font-family: var(--mono); font-size: 0.65rem; color: var(--accent); white-space: nowrap; }
  .file-name { color: var(--ink-mid); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: 0.72rem; }
  .file-size { font-family: var(--mono); font-size: 0.6rem; color: var(--ink-light); white-space: nowrap; }

  /* ── Run controls ── */
  .run-row {
    display: flex; gap: 1rem; align-items: center; margin-bottom: 2rem; flex-wrap: wrap;
  }
  .run-btn {
    background: var(--ink); color: var(--paper); border: none; border-radius: 3px;
    padding: 0.85rem 2rem; font-family: var(--sans); font-size: 0.85rem; font-weight: 600;
    letter-spacing: 0.08em; text-transform: uppercase; cursor: pointer; transition: background 0.15s, transform 0.1s;
  }
  .run-btn:hover:not(:disabled) { background: var(--accent); }
  .run-btn:active:not(:disabled) { transform: translateY(1px); }
  .run-btn:disabled { background: var(--ink-light); cursor: not-allowed; }
  .run-note { font-family: var(--serif); font-style: italic; font-size: 0.82rem; color: var(--ink-light); }

  /* ── Progress ── */
  .progress-panel {
    background: white; border: 1px solid var(--rule); border-radius: 4px;
    padding: 1.5rem; margin-bottom: 2rem; display: none;
  }
  .progress-panel.active { display: block; }

  .progress-header {
    display: flex; align-items: center; justify-content: space-between;
    margin-bottom: 1rem; flex-wrap: wrap; gap: 0.5rem;
  }
  .progress-title { font-family: var(--mono); font-size: 0.68rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-mid); }
  .progress-counts { font-family: var(--mono); font-size: 0.72rem; color: var(--ink); }

  .progress-bar-track {
    height: 4px; background: var(--paper-mid); border-radius: 2px; margin-bottom: 1rem; overflow: hidden;
  }
  .progress-bar-fill {
    height: 100%; background: var(--accent); border-radius: 2px;
    transition: width 0.4s ease; width: 0%;
  }
  .progress-bar-fill.done { background: var(--success); }

  .progress-doc-list {
    max-height: 200px; overflow-y: auto; border: 1px solid var(--paper-mid); border-radius: 3px;
  }
  .progress-doc-item {
    display: grid; grid-template-columns: 1.5rem 1fr auto;
    align-items: center; gap: 0.5rem; padding: 0.4rem 0.75rem;
    border-bottom: 1px solid var(--paper-mid); font-size: 0.72rem;
  }
  .progress-doc-item:last-child { border-bottom: none; }
  .pdoc-status { font-size: 0.75rem; text-align: center; }
  .pdoc-name { color: var(--ink-mid); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-family: var(--mono); font-size: 0.65rem; }
  .pdoc-result { font-family: var(--mono); font-size: 0.6rem; color: var(--ink-light); white-space: nowrap; }
  .pdoc-result.ok   { color: var(--success); }
  .pdoc-result.warn { color: var(--warning); }
  .pdoc-result.err  { color: var(--accent); }
  .pdoc-result.vision { color: var(--new-concept, #2a4a7a); }
  .pdoc-vision-badge {
    font-family: var(--mono); font-size: 0.58rem; letter-spacing: 0.06em;
    text-transform: uppercase; background: #eef3fa; color: #2a4a7a;
    border: 1px solid #b0c4e0; padding: 0.1rem 0.35rem; border-radius: 2px;
    margin-left: 0.35rem; white-space: nowrap;
  }

  .batch-divider {
    display: flex; align-items: center; gap: 0.5rem; padding: 0.5rem 0.75rem;
    background: var(--paper); border-bottom: 1px solid var(--paper-mid);
    font-family: var(--mono); font-size: 0.6rem; letter-spacing: 0.08em;
    text-transform: uppercase; color: var(--ink-light);
  }

  .checkpoint-note {
    display: flex; align-items: center; gap: 0.75rem; padding: 0.75rem 1rem;
    background: var(--success-bg); border: 1px solid var(--success-border);
    border-radius: 3px; margin-top: 0.75rem; font-size: 0.78rem; color: var(--success);
    font-family: var(--serif); font-style: italic;
  }

  /* ── DTM preview ── */
  .dtm-panel { display: none; margin-bottom: 2rem; }
  .dtm-panel.active { display: block; }

  .dtm-toolbar {
    display: flex; align-items: center; justify-content: space-between;
    margin-bottom: 1rem; flex-wrap: wrap; gap: 0.75rem;
  }
  .dtm-summary { font-family: var(--serif); font-size: 1rem; }
  .dtm-summary em { font-style: italic; color: var(--accent); }

  .dtm-actions { display: flex; gap: 0.6rem; }
  .dtm-btn {
    background: var(--ink); color: var(--paper); border: none; border-radius: 3px;
    padding: 0.55rem 1.1rem; font-family: var(--mono); font-size: 0.68rem;
    letter-spacing: 0.08em; text-transform: uppercase; cursor: pointer; transition: background 0.15s;
  }
  .dtm-btn:hover { background: var(--success); }
  .dtm-btn.secondary {
    background: none; border: 1px solid var(--paper-dark); color: var(--ink-mid);
  }
  .dtm-btn.secondary:hover { background: var(--ink); color: var(--paper); border-color: var(--ink); }

  .dtm-table-wrap {
    overflow-x: auto; border: 1px solid var(--rule); border-radius: 4px; background: white;
    max-height: 420px; overflow-y: auto;
  }
  .dtm-table {
    border-collapse: collapse; font-size: 0.7rem; white-space: nowrap; min-width: 100%;
  }
  .dtm-table thead { position: sticky; top: 0; z-index: 2; }
  .dtm-table th {
    background: var(--ink); color: var(--paper); padding: 0.5rem 0.6rem;
    font-family: var(--mono); font-size: 0.58rem; letter-spacing: 0.08em;
    text-transform: uppercase; font-weight: 500; text-align: center; border-right: 1px solid #333;
  }
  .dtm-table th:first-child { text-align: left; min-width: 140px; position: sticky; left: 0; background: var(--ink); }
  .dtm-table th:nth-child(2) { text-align: left; min-width: 200px; }
  .dtm-table tbody tr { border-bottom: 1px solid var(--paper-mid); }
  .dtm-table tbody tr:hover { background: var(--paper); }
  .dtm-table td {
    padding: 0.4rem 0.6rem; border-right: 1px solid var(--paper-mid);
    text-align: center; color: var(--ink-mid); font-family: var(--mono);
  }
  .dtm-table td:first-child {
    text-align: left; font-family: var(--mono); font-size: 0.65rem;
    color: var(--accent); position: sticky; left: 0; background: white; font-weight: 500;
  }
  .dtm-table td:nth-child(2) { text-align: left; color: var(--ink); font-family: var(--sans); font-size: 0.72rem; }
  .dtm-table tbody tr:hover td:first-child { background: var(--paper); }

  .score-0 { color: var(--paper-dark) !important; }
  .score-1 { color: var(--ink-light) !important; }
  .score-2 { color: var(--success) !important; font-weight: 500; }
  .score-3 { color: var(--accent) !important; font-weight: 700; }
  .score-hi { color: var(--success) !important; font-weight: 500; }

  .low-conf-cell { background: var(--warning-bg) !important; }

  /* ── Error ── */
  .error-box {
    background: #fdf0ee; border: 1px solid #e8b4aa; border-radius: 3px;
    padding: 1rem 1.25rem; color: var(--accent); font-size: 0.82rem; margin-bottom: 1rem;
  }
  .error-box strong {
    display: block; font-family: var(--mono); font-size: 0.65rem;
    letter-spacing: 0.06em; text-transform: uppercase; margin-bottom: 0.25rem;
  }

  .callout {
    background: white; border-left: 3px solid var(--accent); padding: 1rem 1.25rem;
    margin-bottom: 2rem; font-family: var(--serif); font-size: 0.88rem;
    line-height: 1.7; color: var(--ink-mid);
  }
  .callout strong { color: var(--ink); font-family: var(--sans); font-size: 0.82rem; }

  @media (max-width: 800px) {
    .config-grid { grid-template-columns: 1fr; }
    .workspace { padding: 1.5rem; }
    header { padding: 1.25rem 1.5rem; }
    .corpus-upload-row { flex-direction: column; }
  }

  /* ── Shared navigation ── */
  .cr-nav { border-bottom: 2px solid var(--ink); padding: 1rem 2rem; display: flex; align-items: center; gap: 1.5rem; flex-wrap: wrap; }
  .cr-nav-logo { font-family: var(--serif); font-weight: 300; font-size: 1.1rem; letter-spacing: -0.02em; text-decoration: none; color: var(--ink); flex-shrink: 0; }
  .cr-nav-logo em { font-style: italic; color: var(--accent); }
  .cr-phases { display: flex; align-items: center; gap: 0; }
  .cr-phase-link { font-family: var(--mono); font-size: 0.6rem; letter-spacing: 0.07em; text-transform: uppercase; text-decoration: none; padding: 0.3rem 0.65rem; border: 1px solid var(--paper-dark); border-right: none; color: var(--ink-light); transition: background 0.15s, color 0.15s; white-space: nowrap; }
  .cr-phase-link:first-child { border-radius: 3px 0 0 3px; }
  .cr-phase-link:last-child { border-right: 1px solid var(--paper-dark); border-radius: 0 3px 3px 0; }
  .cr-phase-link:hover { background: var(--paper-mid); color: var(--ink); }
  .cr-phase-link.current { background: var(--ink); color: var(--paper); border-color: var(--ink); }
  .cr-nav-home { margin-left: auto; font-family: var(--mono); font-size: 0.6rem; letter-spacing: 0.08em; text-transform: uppercase; text-decoration: none; color: var(--ink-light); border-bottom: 1px solid transparent; transition: color 0.15s, border-color 0.15s; }
  .cr-nav-home:hover { color: var(--accent); border-color: var(--accent); }
  .cr-bottom-nav { border-top: 1px solid var(--rule); padding: 1.5rem 2rem; display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 1rem; margin-top: 3rem; background: white; }
  .cr-bottom-btn { font-family: var(--mono); font-size: 0.65rem; letter-spacing: 0.08em; text-transform: uppercase; text-decoration: none; color: var(--ink-mid); padding: 0.5rem 1rem; border: 1px solid var(--paper-dark); border-radius: 3px; transition: all 0.15s; }
  .cr-bottom-btn:hover { background: var(--ink); color: var(--paper); border-color: var(--ink); }
  .cr-bottom-btn.ghost { opacity: 0.25; pointer-events: none; }
  .cr-bottom-center { font-family: var(--mono); font-size: 0.62rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-light); text-align: center; }